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Penton Owners Group

General Discussion => Penton Talk => Topic started by: skiracer on November 28, 2010, 08:07:07 AM

Title: Fork Spring size?
Post by: skiracer on November 28, 2010, 08:07:07 AM
I am rebuilding a pair of 35mm forks, and I am interested in installing new springs to fit my weight and riding style.  Are there any publications out there to calculate spring rates? Thanks, James
Title: Fork Spring size?
Post by: Mike Hufnagel on November 28, 2010, 10:46:27 AM
Try the Race Teck web site. They have a pretty good web site that should tell you what you need. They also have a new suspenion book out that I'm going to get.

Oh yeah, I saw a set of 35mm Marzoochi (?) fork springs on ebay, The rate was listed but I can't remeber it.

Cheers

74 Yamaha TY 250
75 Jackpiner w/ 250 eng.
80 Ktm Mc 400
82 KTM GS250II (import)
82 KTM 495
2) 84 Yam RZ350
98 KTM 300mxc
00 KTM Duke 2
06 KTM 950 Adv.
08 Suzuki DR70Z
Title: Fork Spring size?
Post by: skiracer on November 29, 2010, 07:36:42 AM
Quotequote:Originally posted by Mike Hufnagel

Try the Race Teck web site. They have a pretty good web site that should tell you what you need. They also have a new suspenion book out that I'm going to get.

Oh yeah, I saw a set of 35mm Marzoochi (?) fork springs on ebay, The rate was listed but I can't remeber it.

Cheers

74 Yamaha TY 250
75 Jackpiner w/ 250 eng.
80 Ktm Mc 400
82 KTM GS250II (import)
82 KTM 495
2) 84 Yam RZ350
98 KTM 300mxc
00 KTM Duke 2
06 KTM 950 Adv.
08 Suzuki DR70Z

Thanks Mike!
Title: Fork Spring size?
Post by: joe novak on November 29, 2010, 12:26:36 PM
James, Yes.  Google "spring rate".  There is a formula to determine the rate of a spring.  It is easy to use, and accurate.  I have used the formula and calculated spring rates, and compared them to the manufacturer's claimed rate (for stock car use).  Results are close...  All you need is the 1.wire diameter  2.number of coils 3.do some math.   If I can help you with the math, I will do that for you.   Joe
Title: Fork Spring size?
Post by: skiracer on November 29, 2010, 06:21:13 PM
Quotequote:Originally posted by joe novak

James, Yes.  Google "spring rate".  There is a formula to determine the rate of a spring.  It is easy to use, and accurate.  I have used the formula and calculated spring rates, and compared them to the manufacturer's claimed rate (for stock car use).  Results are close...  All you need is the 1.wire diameter  2.number of coils 3.do some math.   If I can help you with the math, I will do that for you.   Joe

Thanks Joe, As a dual major in Accounting and Finance, math is not a problem for me.    However, I am looking to go the other way.... I want to know what size spring I need to use, not calculate an existing spring.  James
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